irregular change in focal length

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Suspensory ligaments are found in

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Important Questions on Ray Optics

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

The least distance of distinct vision for a young adult with normal vision is

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

The least distance of distinct vision for a normal eye is

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

The least distance of distinct vision for a young adult with normal vision is about

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

Myopia is due to

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

Consider the following vision defects listed in Columns I and II and the corrective measures in Column III. Choose the correct combination.

	$Column I$		$Column II$		$Column III$
P.	Hypermetropia	$(i)$	Near-sightedness	a.	Convex lens
Q.	Myopia	(ii)	Far-sightedness	b.	Concave lens

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

The change that occurs in the eye to see the distant objects clearly is

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

A student studying the similarities and differences between a camera and the human eye makes the following observations:

(I)

Both the eye and the camera have convex lenses.

(II)

In order to focus, the eye lens expands or contracts while the camera lens moves forward or backward.

(III)

The camera lens produces upside down real images while the eye lens produces only upright real images.

(IV)

A screen in camera is equivalent to the retina in the eyes.

(V)

A camera adjusts the amount of light entering in it by adjusting the aperture of the lens. In the eye the cornea controls the amount of light. The correct statements are :

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

A near sighted person has a far point of

20 cm

in front of his eye. What is the power of the lens (in dioptres) which will allow this person to see distant objects clearly?

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

The human eye has a lens which has a:

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

Your friend is having eye sight problem. She is not able to see clearly a distant uniform window mesh and it appears to her as nonuniform and distorted. The doctor diagnosed the problem as :

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

What power should the reading spectacles (lens) have for a person for whom the least distance is

50 cm

(in dioptre)

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

The change in focal length of an eye-lens is caused by the action of the_____.

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

Which one of the following parts of the eye is affected in cataract?

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

A person can see clearly object only when they lie between

50 cm

400 cm

from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

Macula lutea is the part of:

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

Ciliary muscles in the eye:

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

What is the function of aqueous humour.

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye

Which one is an incorrect match?